Samsung LN19D450G1DXZA - Manual (Page 49)

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English
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Auto Volume (Off / Normal / Night)
Normal
equalizes the volume level on each channel, so that when you change
channels, the volume level is the same.
Night equalizes and decrease the volume level on each channel, so each
channel is quieter. Night is useful at night, when you may want to keep the
volume low.
N To use the volume control on the source device connected to the TV,
set
Auto Volume to Off on the TV. Otherwise, a change to the volume
control of the source device may not be applied.